Speculum



'(No ModeL) J. D. SHERBROOK.

SPEGULUM.

No.530,728. PatentedDe0.' 11,1'894.

Lfessez. ,(s er'rdw? I m: Nonms PETERS o0, mofoLrmcL. WASHINGTON. D. Q

UNITED STATES JESSE D. SHERBROOK, OF

PATENT OFFICE.

WINNETOON, NEBRASKA.

SPECULUM.

SPECIFICATION forming part of Letters Patent No. 530,728, dated December11, 1894.

Application filed August 9, 1894.

To all whom it may concern:

Be it known that I, J ESSE D. SHERBROQK, a citizen of the United Statesof America, residing at Winnetoon, in the county of Knox and State ofNebraska, have invented certain new and useful Improvements in Specula;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

This invention relates to improvements in veterinary obstetricalspecula, the purpose thereof being to provide a cheap, simple andeffective speculum which may be used in connection with veterinaryobstetrical forceps for removing pigs, dead or alive, from sows, theparts being so constructed that they can be readily adjusted forapplication and removed with the forceps and animal.

The invention consists in the construction and combination of the parts,as will be hereinafter fully set forth and particularly'pointed out inthe claim.

In the accompanying drawings, forming part of this specification, Figure1 is a sectional view of a speculum constructed in accordance with myinvention. Fig. 2 is a front view, which is adapted to be used inconnection with my invention.

A designates a flat ring which is provided near one edge with slots a aand near its other edge with apertures a, there being preferably four ofeach located around the ring side by side and at equal distances. Theouter surface of the ring is enlarged around each aperture 01. toprovide bearings for set-screws 13 positioned in said apertures, theset-screws having collars b which bear against the inner side of thering and hold them in place.

O'O designate the blades or valves of the speculum which are curvedtransversely in the segment of a circle so that when they are allbrought together with their edges abutting they will form a completecircle. lhese blades are formed of rigid material and are provided withrounded edges and ends. The inner ends of the blades are bent to provideportions 0 which are at nearly right angles with the blades and areadapted to pass Serial No. 519,861. (No model.)

through the slots at in the ring, and assaid portions 0 are ofconsiderable width they will hold the blades in line. Adjoining the bentportions 0 the blades are provided with socketed lugs c which areinternally threaded and into whichpass the set-screws B.

It'will be noted that by the construction hereinbefore described eachindividual blade is independently adjustable and when adj usted by theset-screws will move to and from the center of the supporting and connecting ring A. The shoulders on the setscrews hold the same so that theblades will be positively adjusted when said set-screws are turned.

It is well known in veterinary practice that sows, especially those thatare highly inbred, have difficulty in giving birth and that assistanceis required to deliver their young. This device is adapted to provideconvenient and efficient means which may be used not only by aveterinary surgeon but also by those unskilled in veterinary practice orthe use of veterinary instruments.

In inserting the speculum the blades are first brought together, asshown in full lines Fig. 1, and they are afterward separated by suitablyadjusting the thumb-screws B. This gives the operator an opportunity tosee'the position of the pig so that it can be properly grasped by theforceps, and after being grasped the speculum, forceps and pig are re-'moved.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A speculum for veterinary use comprising a fiat ring having slots at aand apertures a, blades 0 curved transversely in the segmentof a circleand having internally screwthreaded lugs c and projecting portions 0which pass through the slots at, and thumb screws B retained in theapertures a by shoulders and engaging the screw-threaded lugs on theblades, substantially as shown and described.

In testimony whereof I aflix my signature in 100 presence of twowitnesses.

JESSE n. SHERBROOK.

Witnesses;

-S. DRAPER, M. Euro.

